System for controlling electric circuits.



G- W. HART. SYSTEM FOKGONTROLLING ELECTRIC CIRCUITS.

APPLICATION FILED JUNE 30, 1910.

988,093. Patented Mar. 28, 1911.

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SYSTEM FOR CONTROLLING ELECTRIC CIRCUITS.

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UNITED STATES PATENT OFFICE.

GERALD W. HART, OF WEST HARTFORD, CONNECTICUT, ASSIGNOR TO THE HART MAN- UFACTURING COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

SYSTEM FOR CONTROLLING ELECTRIC CIRCUITS.

Specification of Letters Patent.

Patented Mar. 28, 1911.

Application filed .Tune 30, 1910. Serial No. 569,628.

To all whom it may concern:

Be it known that I, GERALD W. HART, a citizen of the Unit-ed States, residin at West Hartford, county of Hartford, tate of Connecticut, have invented certain new and useful Improvements in Systems for .Controlling Electric Circuits, of which the following is a full, clear, and exact description.

My invention relates to systems for controlling electric circuits, and has for its object to provide a plurality of branch circuits with electro-magnetically controlled switches so interconnected that all the switches can be controlled electro-magnetically from a single point, 'so as to open their respective branch circuits.

It further has for its object to provide means for cutting out the controlling solenoid of anyswitch by the action of that switch due to its solenoid.

It further has for its object to provide an arrangement such that if any circuit to which the local controlling circuit is connected is interrupted, between the switch and the mains, as for instance by the blowing of a fuse, the current flowing to the translating devices in that branch will .be completely interrupted, although the switch remains closed.

The following is a descri tion of my invention, reference being ha to the accompanying drawings, in which Figure 1 shows diagrammatically a plan view of an electro-magnetically operated lating switch arms CD insulated fromone another, D being the main switch arm and C being an auxiliary switch arin.

E-E, are contacts carried by the base and engaged and disengaged by the switch arm 0, and F- -F are contacts carried by the base engaged and disengaged by the switch arm D.

G is an solenoid core connected by a link G to a part of the moving system such as the switch arms 0, and H is a solenoid winding acting upon said core.

I-I are ush buttons connected to the switch arm J is a spring engaging a projection K to cause the switch arms to make a complete quick throw.

Referring to Fi 3, M-'-M are mains from which extend ranches N N- N N and N'*-N-, &c. O. O O are three switches, such, for instance, as shown in Figs. 1 and 2. HH are solenoids corresponding to the solenoid H of Fig. 1. P- constitute the sidesof a local circuit to which the solenoids HH --H are connected in multiple. One side of this local circuit is connected to the main M, and the other side of the local circuit is connected to the main M, the connections being preferably through one pair of branch circuits NN. As shown, the side P is connected to the contact F As shown, the other side P of the local circuit is connected to the other side N of the same branch circuit, this being usually most convenient. This local circuit is interru ted at Q, and a local circuit controller R is provided for closing and opening this interruption. S-SS -S S S are fuses between the switches and the mains M-M. 7 are fuses in series with the fuses S-S' and ofsmaller capaclty than SS. T'T 8 are translating de-' vices. The switch arms C- G correspond to the switch arm G, and, together .with their contacts, are connected to the sides P'P' so as to be in arallel with each other and in series with t e solenoid w ndings H-H H respectively. The,sw1tch ll. When any oi the push buttons I-I oi the switches O'--O O are actuated so as to close their switches, the local circuit,-

except for the interruption at the local circuit controller R, is completed through the corresponding solenoids H-H- When the local circuit controller R is closed so as to complete the local circuit P-P, all of the solenoids HH -H whose switches are closed, are energized, and each acts to move its respective switch so as to cause it to open its branch circuit, and also disconnect its solenoid from one of the sides PP of the local circuit.

The action of the several switches is not necessarily simultaneous, and as any switch operates, the part of the local circuit passing through its solenoid is automatically broken. The arrangement can be used with two switches, or with a greater number as desired. The manual opening of any switch does not interfere with the electromagnetic operation of any that are closed.

In the preferred arrangement shown, the blowing of any of the fuses S SSS does not interfere with the electro-ma etic operation of any of the switches. The lowing of either fuse S-S interferes with the electro-magnetic operation of all the switches, but completely cuts oil all current from the translating device T of the switch 0 without affecting the flow of current in the other branch circuits. If desired, the

fuses S--S of smaller capacity than SS- may be used, so that an overload will blow them instead of the fuses SS, and thus out out the overload without interfering with the circuit P-P.

The arrangement is simple and efficient and permits of various modifications, but the arrangement shown and described is the arrangement which I prefer to use.

What I claim is:

1. In a system for controlling electric circuits, the combination of a pair of mains, a plurality of branch circuits including pairs of conductors and translating devices, connected in parallel to said mains, a luralit of electric sjvitches controlling sai branc circuits respectively, each switchw having a solenoid w ereby 1t ma local circuit to which sai solenoids are connected in parallel said local circuit having its sides connected to the two mains respectively, a local circuit controller in said local circuit, and means for cutting any of said be controlled, a

solenoids out of the local circuit when its switch has been controlled thereby.

2. In a system for controlling electric circuits, the combination of a pair of mains, a plurality of branch circuits including pairs of conductors and translating devices, connected in parallel to said mains, a plurality of electric switches controlling said branch circuits, each having a solenoid whereby it may be controlled, a local circuit to which said solenoids are connected in parallel, said local circuit having its sides connected to the two mains respectively through two branch conductors of opposite polarity, a local circuit controller in said local circuit, and means for cutting any of said solenoids out of the local circuit when its switch has been controlled thereby.

3. In a system for controlling electric circuits, the combination of a pair of mains, a plurality of branch circuits including pairs of conductors and translating devices, con-' nected in parallel to said mains, a pluralit of electric switches controllingsaid branc circuits, each having a solenoid whereby it may be controlled, a'local circuit to which said solenoids are connected in parallel, said local circuit having its sides connected to the two mains respectivel through two branch conductors of opposite polarity constituting portions of one branch circuit, a local circuit controller in said local circuit, and means for cutting any of said solenoids out of the local circuit when its switch has been controlled thereby.

4. In a system for controlling electric circuits, the combination of a pair of mains, a plurality of branch circuits including pairs of conductors and translatin devices, connected in parallel to said mains, a plurality of switches controlling saidv branch circuits, each switch having a main switch-arm in series with said translating devices, an, auxiliary switch-arm, and a controlling solenoid, said solenoids bein connected in series with said auxiliary switc -arms respectively, and a local controlling circuit connected across the mains and to which the solenoids and auxiliary switch-arms of each switch are connected in parallel to the solenoids and auxiliary switch-arms of the other switches, and a local circuit controller in' said local circuit.

5. In a system for controlling electric circuits, the COmbiDHtlOIl-0f a pair of mains, a

plurality of branch-circuits including pairs.

of conductors and translatin devices, connected in parallel to said-mains, a plurality of switches controlling said branch circuits; each switch having a xnain switch-arm in series with said translating, devices an auxiliary switcharm, and a contro ng solenoid, said solenoids being connected in a series with said auxiliary switch-arms respectively, a local controlling circuit con- 'noids and auxiliary switch-arms of the other switches, the connection of one side of said local circuit to said mains being through a branchfcircuit, and a fuse located in said last named branch circuit between 10 said connection and said main, and a local circuit controller in said local circuit.

GERALD W. HART. Witnesses:

L. S. JAMES, IDA M. HUNZIKER. 

